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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName CALAMOS INVESTMENT TRUST/IL
Prospectus Date rr_ProspectusDate Mar. 01, 2019
Calamos Market Neutral Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Calamos Market Neutral Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Calamos Market Neutral Income Fund’s investment objective is high current income consistent with stability of principal.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. You may qualify for sales charge discounts on purchases of Class A shares if you and your family invest, or agree to invest in the future, at least $100,000 in Calamos Funds. More information about these and other discounts is available from your financial professional and under “Fund Facts — What classes of shares do the Funds offer?” on page 123 of the Fund’s prospectus, in the Appendix to this prospectus and “Share Classes and Pricing of Shares” on page 73 of the Fund’s statement of additional information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <b>Shareholder Fees (fees paid directly from your investment):</b>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <b>Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):</b>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 66.8% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 66.80%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts on purchases of Class A shares if you and your family invest, or agree to invest in the future, at least $100,000 in Calamos Funds. More information about these and other discounts is available from your financial professional and under “Fund Facts — What classes of shares do the Funds offer?” on page 123 of the Fund’s prospectus, in the Appendix to this prospectus and “Share Classes and Pricing of Shares” on page 73 of the Fund’s statement of additional information.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then either redeem or do not redeem your shares at the end of the reflected time periods. The example also assumes that your investment has a 5% return each year, that all dividends and capital gain distributions are reinvested, that you pay a maximum initial or contingent deferred sales charge and that the Fund’s operating expenses remain the same. Although your actual performance and costs may be higher or lower, based on these assumptions, your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption You would pay the following expenses if you redeemed your shares at the end of the period:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption You would pay the following expenses if you did not redeem your shares:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund’s investment strategy can be characterized as “market neutral” because it seeks to achieve maximum current income while maintaining a low correlation to the fluctuations of the U.S. equity market as a whole. The Fund invests (i) equities (ii) convertible securities (including synthetic convertible securities) of U.S. companies without regard to market capitalization and (iii) employs short selling and enters into total return swaps to enhance income and hedge against market risk. The convertible securities in which the Fund invests may be either debt securities or preferred stocks that can be exchanged for common stock. The average term to maturity of the convertible securities purchased by the Fund will typically range from two to ten years.

A synthetic convertible instrument is a financial instrument (or two or more securities held in tandem) that is designed to simulate the economic characteristics of a convertible security through the combined features of a debt instrument and a security providing an option on an equity security. The Fund may establish a synthetic convertible instrument by combining fixed-income securities (which may be either convertible or non-convertible) with the right to acquire equity securities. In establishing a synthetic instrument, the Fund may combine a basket of fixed-income securities with a basket of warrants or options that together produce economic characteristics similar to a convertible security. Within each basket of fixed-income securities and warrants or options, different companies may issue the fixed-income and convertible components, which may be purchased separately and at different times.

The Fund may seek to generate income from option premiums by writing (selling) options. This would include the use of both call and put options. The Fund may write call options (i) on a portion of the equity securities (including securities that are convertible into equity securities) in the Fund’s portfolio and (ii) on broad-based securities indexes (such as the S&P 500 or MSCI EAFE) or ETFs (exchange traded funds).

In addition, to seek to offset some of the risk of a potential decline in value of certain long positions, the Fund may also purchase put options on individual securities, broad-based securities indexes (such as the S&P 500), or ETFs.

The Fund may invest without limit in high yield fixed-income securities (often referred to as “junk bonds”). In addition, the Fund may engage in active and frequent trading of portfolio securities. The Fund may also invest in ETFs. The Fund’s investment adviser seeks to lower the risks of investing in stocks by using a “top-down approach” of diversification by company, industry, sector, country and currency and focusing on macro-level investment themes.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock An investment in the Fund is subject to risks, and you could lose money on your investment in the Fund. There can be no assurance that the Fund will achieve its investment objective. The risks associated with an investment in the Fund can increase during times of significant market volatility. Your investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The principal risks of investing in the Fund include:
  • Convertible Hedging Risk — If the market price of the underlying common stock increases above the conversion price on a convertible security, the price of the convertible security will increase. The Fund’s increased liability on any outstanding short position would, in whole or in part, reduce this gain.
  • Convertible Securities Risk — The value of a convertible security is influenced by changes in interest rates, with investment value declining as interest rates increase and increasing as interest rates decline. The credit standing of the issuer and other factors also may have an effect on the convertible security’s investment value.
  • Covered Call Writing Risk — As the writer of a covered call option on a security, the Fund foregoes, during the option’s life, the opportunity to profit from increases in the market value of the security, covering the call option above the sum of the premium and the exercise price of the call.
  • Debt Securities Risk — Debt securities are subject to various risks, including interest rate risk, credit risk and default risk.
  • Interest Rate Risk — The value of debt securities generally decreases in periods when interest rates are rising. In addition, interest rate changes typically have a greater effect on prices of longer-term debt securities than shorter term debt securities. Recent fixed-income market events, including increases in volatility and interest rates, may expose the Fund to heightened interest rate risk and volatility.
  • Credit Risk — A debt security could deteriorate in quality to such an extent that its rating is downgraded or its market value declines relative to comparable securities. If the Fund holds securities that have been downgraded, or that default on payment, the Fund’s performance could be negatively affected.
  • Default Risk — A company that issues a debt security may be unable to fulfill its obligation to repay principal and interest. The lower a bond is rated, the greater its default risk. To the extent the Fund holds securities that have been downgraded, or that default on payment, its performance could be negatively affected.
  • Derivatives Risk — Derivatives are instruments, such as futures and forward foreign currency contracts, whose value is derived from that of other assets, rates or indices. The use of derivatives for non-hedging purposes may be considered more speculative than other types of investments. Derivatives can be used for hedging (attempting to reduce risk by offsetting one investment position with another) or non-hedging purposes. Hedging with derivatives may increase expenses, and there is no guarantee that a hedging strategy will work. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. In addition, derivative instruments are subject to counter party risk, meaning that the party who issues the derivatives may experience a significant credit event and may be unwilling or unable to make timely settlement payments or otherwise honor its obligations. Changes in the value of a derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested.
  • Equity Securities Risk — The securities markets are volatile, and the market prices of the Fund’s securities may decline generally. The price of equity securities fluctuates based on changes in a company’s financial condition and overall market and economic conditions. If the market prices of the securities owned by the Fund (i.e., the Fund’s long position) fall, the value of your investment in the Fund will decline.
  • Foreign Securities Risk — Risks associated with investing in foreign securities include fluctuations in the exchange rates of foreign currencies that may affect the U.S. dollar value of a security, the possibility of substantial price volatility as a result of political and economic instability in the foreign country, less public information about issuers of securities, different securities regulation, different accounting, auditing and financial reporting standards and less liquidity than in U.S. markets.
  • High Yield Risk — High yield securities and unrated securities of similar credit quality (commonly known as “junk bonds”) are subject to greater levels of credit and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer’s continuing ability to make principal and interest payments.
  • Liquidity Risk — Liquidity risk exists when particular investments are difficult to purchase or sell. The Fund’s investments in illiquid securities may reduce the returns of the Fund because it may be unable to sell the illiquid securities at an advantageous time or price.
  • Options Risk — The Fund’s ability to close out its position as a purchaser or seller of an over-the-counter or exchange-listed put or call option is dependent, in part, upon the liquidity of the option market. There are significant differences between the securities and options markets that could result in an imperfect correlation among these markets, causing a given transaction not to achieve its objectives. The Fund’s ability to utilize options successfully will depend on the ability of the Fund’s investment adviser to predict pertinent market movements, which cannot be assured.
  • Other Investment Companies (including ETFs) Risk — The Fund may invest in the securities of other investment companies to the extent that such investments are consistent with the Fund’s investment objective and the policies are permissible under the 1940 Act. Under the 1940 Act, the Fund may not acquire the securities of other domestic or non-U.S. investment companies if, as a result, (1) more than 10% of the Fund’s total assets would be invested in securities of other investment companies, (2) such purchase would result in more than 3% of the total outstanding voting securities of any one Investment company being held by the Fund or (3) more than 5% of the Fund’s total assets would be invested in any one investment company. These limitations do not apply to the purchase of shares of money market funds or of any investment company in connection with a merger, consolidation, reorganization or acquisition of substantially all the assets of another investment company, or to purchases of investment companies done in accordance with SEC exemptive relief or rule. Investments in the securities of other investment companies, including ETFs, may involve duplication of advisory fees and certain other expenses. Additionally, if the investment company or ETF fails to achieve its investment objective, the value of the Fund’s investment will decline, adversely affecting the Fund’s performance. In addition, closed end investment company and ETF shares potentially may trade at a discount or a premium and are subject to brokerage and other trading costs, which could result in greater expenses to the Fund. In addition, the Fund may engage in short sales of the securities of other investment companies. When the Fund shorts securities of another investment company, it borrows shares of that investment company which it then sells. The Fund closes out a short sale by purchasing the security that it has sold short and returning that security to the entity that lent the security.
  • Portfolio Selection Risk — The value of your investment may decrease if the investment adviser’s judgment about the attractiveness, value or market trends affecting a particular security, issuer, industry or sector or about market movements is incorrect.
  • Portfolio Turnover Risk — The portfolio managers may actively and frequently trade securities or other instruments in the Fund’s portfolio to carry out its investment strategies. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent and active trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.
  • Rule 144A Securities Risk — The Fund may invest in securities that are issued and sold through transactions under Rule 144A of the Securities Act of 1933. Under the supervision of its board of trustees, the Fund will determine whether Rule 144A Securities are illiquid. If qualified institutional buyers are unwilling to purchase these Rule 144A Securities, the percentage of the Fund’s assets invested in illiquid securities would increase. Typically, the Fund purchases Rule 144A Securities only if the Fund’s adviser has determined them to be liquid. If any Rule 144A Security held by the Fund should become illiquid, the value of the security may be reduced and a sale of the security may be more difficult.
  • Sector Risk — To the extent the Fund invests a significant portion of its assets in a particular sector, a greater portion of the Fund’s performance may be affected by the general business and economic conditions affecting that sector. Each sector may share economic risk with the broader market, however there may be economic risks specific to each sector. As a result, returns from those sectors may trail returns from the overall stock market and it is possible that the Fund may underperform the broader market, or experience greater volatility.
  • Securities Lending Risk — The Fund may lend its portfolio securities to broker-dealers and banks in order to generate additional income for the Fund. Any such loan must be continuously secured by collateral in cash or cash equivalents maintained on a current basis in an amount at least equal to the market value of the securities loaned by the Fund. In the event of bankruptcy or other default of a borrower of portfolio securities, the Fund could experience both delays in liquidating the loan collateral or recovering the loaned securities and losses, including (a) possible decline in the value of the collateral or in the value of the securities loaned during the period while the Fund seeks to enforce its rights thereto, (b) possible subnormal levels of income and lack of access to income during this period, and (c) expenses of enforcing its rights. In an effort to reduce these risks, the Fund’s securities lending agent monitors, and reports to Calamos Advisors on, the creditworthiness of the firms to which a Fund lends securities. The Fund may also experience losses as a result of a diminution in value of its cash collateral investments.
  • Short Sale Risk — The Fund may incur a loss (without limit) as a result of a short sale if the market value of the borrowed security (i.e., the Fund’s short position) increases between the date of the short sale and the date the Fund replaces the security. The Fund may be unable to repurchase the borrowed security at a particular time or at an acceptable price.
  • Small and Mid-Sized Company Risk — Small and mid-sized company stocks have historically been subject to greater investment risk than large company stocks. The prices of small and mid-sized company stocks tend to be more volatile than prices of large company stocks.
  • Synthetic Convertible Instruments Risk — The value of a synthetic convertible instrument will respond differently to market fluctuations than a convertible security because a synthetic convertible instrument is composed of two or more separate securities, each with its own market value. In addition, if the value of the underlying common stock or the level of the index involved in the convertible component falls below the exercise price of the warrant or option, the warrant or option may lose all value.
  • Tax Risk — The federal income tax treatment of convertible securities or other securities in which the Fund may invest may not be clear or may be subject to recharacterization by the Internal Revenue Service. It could be more difficult to comply with the tax requirements applicable to regulated investment companies if the tax characterization of investments or the tax treatment of the income from such investments were successfully challenged by the Internal Revenue Service. Any such failure to comply with the rules applicable to regulated investment companies could cause the Fund to fail to qualify as such.
  • Total Return Swap Risk — A total return swap is a contract in which one party agrees to make periodic payments to another party based on the change in market value of the assets underlying the contract, which may include a specified security, basket of securities, or securities indices during the specified period, in return for periodic payments based on a fixed or variable interest rate or the total return from other underlying assets. Total return swap agreements may be used to obtain exposure to a security or market without owning or taking physical custody of such security or investing directly in such market. Total return swap agreements may effectively add leverage to a fund’s portfolio because, in addition to its total net assets, the fund would be subject to investment exposure on the notional amount of the swap. The primary risks associated with total return swaps are credit risk (if the counterparty fails to meet its obligations) and market risk (if there is no liquid market for the agreement or unfavorable changes occur to the underlying asset).
Risk Lose Money [Text] rr_RiskLoseMoney An investment in the Fund is subject to risks, and you could lose money on your investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Your investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Fund Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart and table indicate the risks of investing in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and how the Fund’s average annual total returns compare with those of a broad measure of market performance. All returns include the reinvestment of dividends and distributions. As always, please note that the Fund’s past performance (before and after taxes) cannot predict how it will perform in the future. Updated performance information is available at no cost by visiting www.calamos.com or by calling 800.582.6959.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table indicate the risks of investing in the Fund by showing changes in the Fund’s performance from calendar year to calendar year and how the Fund’s average annual total returns compare with those of a broad measure of market performance.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The FTSE 30 Day Treasury Bill Index is generally considered representative of the performance of short-term money market investments. The FTSE 30 Day Treasury Bill Index is provided to show how the Fund’s performance compares with the returns of an index of securities similar to those in which the Fund invests.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800.582.6959
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.calamos.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As always, please note that the Fund’s past performance (before and after taxes) cannot predict how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading <b>CLASS I ANNUAL TOTAL RETURN FOR YEARS ENDED 12.31 </b>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Highest Quarterly Return:   8.12% (6.30.09)      Lowest Quarterly Return:   -4.45% (6.30.10)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns as of 12.31.18
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown The after-tax returns are shown only for Class I shares<br/><br/> After-tax returns for classes other than Class I will vary from returns shown for Class I.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other returns for the same period due to a tax benefit of realizing a capital loss on the sale of Fund shares.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The following table shows how the Fund’s average annual performance (before and after taxes) for the one-, five- and ten-year periods ended December 31, 2018 and since the Fund’s inception compared with broad measures of market performance. “Since Inception” returns shown for each index are returns since the inception of the Fund’s Class A shares, or since the nearest subsequent month end when comparative index data is available only for full monthly periods. The after-tax returns show the impact of assumed federal income taxes on an investment in the Fund. “Return After Taxes on Distributions” shows the effect of taxable distributions, but assumes that you still hold the Fund shares at the end of the period and so do not have any taxable gain or loss on your investment. “Return After Taxes on Distributions and Sale of Fund Shares” shows the effect of taxable distributions and any taxable gain or loss that would be realized if the Fund shares were purchased at the beginning and sold at the end of the specified period.

The after-tax returns are shown only for Class I shares, and are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. After-tax returns for classes other than Class I will vary from returns shown for Class I. “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other returns for the same period due to a tax benefit of realizing a capital loss on the sale of Fund shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock The FTSE 30 Day Treasury Bill Index is generally considered representative of the performance of short-term money market investments. The FTSE 30 Day Treasury Bill Index is provided to show how the Fund’s performance compares with the returns of an index of securities similar to those in which the Fund invests.
Average Annual Return, Caption rr_AverageAnnualReturnCaption <b>AVERAGE ANNUAL TOTAL RETURNS — FOR THE PERIODS ENDED 12.31.18</b>
Calamos Market Neutral Income Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.25%
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the redemption price or offering price) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.66%
Distribution and/or Service Fees (12b-1) rr_DistributionAndService12b1FeesOverAssets 0.25%
Dividend Expense on Short Positions rr_Component1OtherExpensesOverAssets 0.18%
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.16%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26%
One Year rr_ExpenseExampleYear01 $ 350
Three Years rr_ExpenseExampleYear03 616
Five Years rr_ExpenseExampleYear05 901
Ten Years rr_ExpenseExampleYear10 1,714
One Year rr_ExpenseExampleNoRedemptionYear01 350
Three Years rr_ExpenseExampleNoRedemptionYear03 616
Five Years rr_ExpenseExampleNoRedemptionYear05 901
Ten Years rr_ExpenseExampleNoRedemptionYear10 $ 1,714
ONE YEAR rr_AverageAnnualReturnYear01 (0.71%)
FIVE YEAR rr_AverageAnnualReturnYear05 1.76%
TEN YEAR rr_AverageAnnualReturnYear10 4.11%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 5.96%
INCEPTION DATE OF CLASS rr_AverageAnnualReturnInceptionDate Sep. 04, 1990
Calamos Market Neutral Income Fund | Class C  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the redemption price or offering price) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.66%
Distribution and/or Service Fees (12b-1) rr_DistributionAndService12b1FeesOverAssets 1.00%
Dividend Expense on Short Positions rr_Component1OtherExpensesOverAssets 0.18%
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.16%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.01%
One Year rr_ExpenseExampleYear01 $ 304
Three Years rr_ExpenseExampleYear03 631
Five Years rr_ExpenseExampleYear05 1,083
Ten Years rr_ExpenseExampleYear10 2,338
One Year rr_ExpenseExampleNoRedemptionYear01 204
Three Years rr_ExpenseExampleNoRedemptionYear03 631
Five Years rr_ExpenseExampleNoRedemptionYear05 1,083
Ten Years rr_ExpenseExampleNoRedemptionYear10 $ 2,338
ONE YEAR rr_AverageAnnualReturnYear01 (0.24%)
FIVE YEAR rr_AverageAnnualReturnYear05 1.99%
TEN YEAR rr_AverageAnnualReturnYear10 3.84%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 3.51%
INCEPTION DATE OF CLASS rr_AverageAnnualReturnInceptionDate Feb. 16, 2000
Calamos Market Neutral Income Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lesser of the redemption price or offering price) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.66%
Distribution and/or Service Fees (12b-1) rr_DistributionAndService12b1FeesOverAssets none
Dividend Expense on Short Positions rr_Component1OtherExpensesOverAssets 0.18%
Remainder of Other Expenses rr_Component2OtherExpensesOverAssets 0.15%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.00%
One Year rr_ExpenseExampleYear01 $ 102
Three Years rr_ExpenseExampleYear03 319
Five Years rr_ExpenseExampleYear05 553
Ten Years rr_ExpenseExampleYear10 1,225
One Year rr_ExpenseExampleNoRedemptionYear01 102
Three Years rr_ExpenseExampleNoRedemptionYear03 319
Five Years rr_ExpenseExampleNoRedemptionYear05 553
Ten Years rr_ExpenseExampleNoRedemptionYear10 $ 1,225
2009 rr_AnnualReturn2009 14.11% [2]
2010 rr_AnnualReturn2010 5.21% [2]
2011 rr_AnnualReturn2011 2.71% [2]
2012 rr_AnnualReturn2012 6.05% [2]
2013 rr_AnnualReturn2013 6.17% [2]
2014 rr_AnnualReturn2014 2.21% [2]
2015 rr_AnnualReturn2015 1.30% [2]
2016 rr_AnnualReturn2016 5.04% [2]
2017 rr_AnnualReturn2017 4.75% [2]
2018 rr_AnnualReturn2018 1.80% [2]
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <b>Highest Quarterly Return:</b>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.12%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <b>Lowest Quarterly Return:</b>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.45%)
ONE YEAR rr_AverageAnnualReturnYear01 1.80%
FIVE YEAR rr_AverageAnnualReturnYear05 3.01%
TEN YEAR rr_AverageAnnualReturnYear10 4.88%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 4.42%
INCEPTION DATE OF CLASS rr_AverageAnnualReturnInceptionDate May 10, 2000
Calamos Market Neutral Income Fund | Return after taxes on distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
ONE YEAR rr_AverageAnnualReturnYear01 0.28% [3]
FIVE YEAR rr_AverageAnnualReturnYear05 2.09% [3]
TEN YEAR rr_AverageAnnualReturnYear10 4.17% [3]
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 3.01% [3]
INCEPTION DATE OF CLASS rr_AverageAnnualReturnInceptionDate May 10, 2000 [3]
Calamos Market Neutral Income Fund | Return after taxes on distributions and sale of Fund shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
ONE YEAR rr_AverageAnnualReturnYear01 1.54% [3]
FIVE YEAR rr_AverageAnnualReturnYear05 2.15% [3]
TEN YEAR rr_AverageAnnualReturnYear10 3.78% [3]
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 3.03% [3]
INCEPTION DATE OF CLASS rr_AverageAnnualReturnInceptionDate May 10, 2000 [3]
Calamos Market Neutral Income Fund | Bloomberg Barclays U.S. Government/Credit Index  
Risk/Return: rr_RiskReturnAbstract  
ONE YEAR rr_AverageAnnualReturnYear01 (0.42%)
FIVE YEAR rr_AverageAnnualReturnYear05 2.53%
TEN YEAR rr_AverageAnnualReturnYear10 3.46%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 5.91%
Calamos Market Neutral Income Fund | FTSE 30-Day Treasury Bill Index  
Risk/Return: rr_RiskReturnAbstract  
ONE YEAR rr_AverageAnnualReturnYear01 1.82%
FIVE YEAR rr_AverageAnnualReturnYear05 0.57%
TEN YEAR rr_AverageAnnualReturnYear10 0.32%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 2.50%
Calamos Market Neutral Income Fund | S&P 500 Index  
Risk/Return: rr_RiskReturnAbstract  
ONE YEAR rr_AverageAnnualReturnYear01 (4.38%)
FIVE YEAR rr_AverageAnnualReturnYear05 8.49%
TEN YEAR rr_AverageAnnualReturnYear10 13.12%
SINCE INCEPTION rr_AverageAnnualReturnSinceInception 9.77%
[1] “Acquired Fund Fees and Expenses” include certain expenses incurred in connection with the Fund’s investment in various money market funds and ETFs.
[2] Annual returns for Class I are provided because Class I shares represent the largest percentage of assets in the Calamos Family of Funds.
[3] Returns after taxes for Class I are provided because Class I shares represent the largest percentage of assets in the Calamos Family of Funds.